Organic compound and process for preparing the same



by the formula Patented Aug." 31, 1943 ORGANIC co AND rmc ssro THEBAME Josef mm is. J.

' he-Nemours & Comp corporation of Delaware ,No aApplicati ,assignortoR LduPont Wilmington, Del., a

Serial No. 375,017

9 Claims. (cleric-140M i this invention re ates to n vel organic comp unds and to processesfor making the same.

i More particularly this invention dealswith the preparation ,acid and N-substituted derivatives thereof, as well as salts of any of these. i a

:It is an'object of this invention to produce novel organic compounds which are characterzlded by possessing in their molecule both; an amino group and a phosphonate radical, the'lat terterm being used as a generic expression for .the phosphonic acidradical and its salts.

i, The novel compounds of this invention may be considered as derived all from the simplest member of the series: amino-methylene phosphonic 1 acid, which may be represented by the formula of amino-methylene-phosphonic V v, on The remainingmembersoftheseries differ from 1 this simple formula by havingone ofthehydrogen atoms of the NH: group replaced by an alkyl, aralkyl or aryl radical, or by having one or both hydrogen atoms of the phosphonic acid radical replaced by a suitable cation. The generalseries of novel compounds may therefore, be represented The novel compounds of this series arecharacterized by being-concurrently acids and amines,

and are therefore capable of the same reactions with long-chain aliphatic acyl halides to produce water-repellency and softening agents. l According to this invention, I produce the novel compoundsby subjecting to hydrolysis by the aid of mineral acid, for instance aqueous hydrochloric, sulfulfic'or phosphoric acid, an acylas the glyclnes and taurines. Accordingly, they have potential utility in all fields of organic synthesis wherein glycine (NH2-CH2-COOH) or may be arylatedwithchrornophor-bearing aromatic compounds having a reactive halogen atom to produce dyestuffs, and they maybe acylated 'amido-rnethylene-phosphonic acid of the general '(orfa salt thereof), or an N-carbomethorqramino-methylene phosphonic acidof the general formula v V ne-o cowNcm-rowmy (or a salt thereof) wherein R and R stand for albl, aralkyl or aryl radicals.

The hydrolysi is effected by heating said phosphonic acid compound with an aqueous solution of said mineral acid at a temperature above 0., preferably to'100' C.,for a prolonged period (12 hours or more) until the mass, which consisted originally of a white solid suspended in an aqueous phase, has changed to an oily phase and a homogeneous aqueous phase, and the oily phase no v longer contains phosphorus.

The said initial materials are themselves products of recent invention and are more fully de- I of formula R'-,CONHCI-I:OH or to produce an intermediate dihalogen phosphorus ester, 1 which rearranges spontaneously into a phosphone-dihalide, and then hydrolyzing the latter to produce the phosphonic acid. The transformation in the case of the methylol amide,

for instance, is expressed in the said copending application by the following'series of equations:

w-oonn-cmornrcn l R-C ONH'CHz-O-PC11. (phosphorous ester) RCONH+CHgPO Clg (phosphone dichloride) Ik-CONlL-CHf-PO(OB);.,..;-(phosphonic acid) The salts of my novelcompounds above, both normal and acid salts, may be prepared by neutralizing th corresponding phosphonic acids with one or two equivalents of a compound of basic reaction, for instance sodium-carbonate, sodium pounds for neutralization, mixed di-salts may be obtained.

Without limiting my invention to any particu-.

lar procedure, the following examples aregiven to illustrate my preferred mode of operation. Parts mentioned are by weight.

Example 1.-Amino-methyZene-phosphonic acid 100 parts of methylol stearamide were added gradually to a mixture of 45 partsof carbon' crystallized from hot water,.and analyzed: 11.8% N and 27.99% P. The theory for NH2-CH2PO(OH)2 requires 12.6% N and 27.9% P.

Eaxtmple 3.Same. Diflerent initial material 100 parts of the methylene phosphonic acid of stearyl carbamate as prepared according to Example 8 of Engelmann and Pikl Case 1. and having the formula were heated with 2000 parts of dilute hydrochloric tetrachloride and 91 parts of phosphorus trichloride. One hour after all the methylol amide had been added, 40 parts of acetic acid were added andthe reaction masswas allowed to stand at room temperature for four days. The reaction mixture gradually .became a viscous mass and at the same timefs oluble in dilute alkalies. The reactionmass which now contained probably thephosphone dichloride was treated with aqueous hydrochloric acid of'8% strength, at about 50 C. for two hours and yielded a crystalline, readily filterable, product which was then recrystallized from alcohol. The crystalline product melted to an opaque mass at about 108 C. but .did not become completely homogeneous until heated to a much higher temperature. It was readily soluble in .dilute alkalies and in hot water giving a viscous foaming solution. This product is believed to be stearamidomethyl phosphonic acid of the formula 67 parts of the last inentioned product were heated in 1700 parts of hydrochloric acid at 70 to 80 C. for 24hours, with agitation. A viscous mass resulted, which uponcooling and fil- :tering left a white-filter cake-which was identifiedas stearic acid. .The filtrate upon evaporation. gave 22 parts of residue-which upon recrystallization fromwater resulted in a colorless crystalline'solid, solublein water with an acid reaction and analyzing, I r

C=10.75%, H=5.0%, P:27.2%'. N=12.5%

Theory for NHz-CHz-PO(OH)2 is :This product did not melt up to300 c. Example 2.-Same. Different initial material After this time the solution was evaporated to dryness and the residue was taken up ina small amount of water. wEthyl alcohol was now. gradacid (8% HCl) for 20 hours at to C. The oilytoplayer was discarded and the aqueous layer was evaporated in vacuo until all the water was removed: The residue yielded upon treatment with dilute alcohol a considerable amount of crystals which had the same properties, and presumably the same constitution, as the product described in Example 1. i

Example 4.-.-Methylamino-methylenev phosphonic acid I 70. parts of chloromethyl-methyl stearamid (which has been prepared in known manner by reacting methyl stearamide with formaldehyde and. hydrogen chloride; see U. S. P. 2,131,362) were dissolved in 200 parts of benzene; 40 parts of dry potassium carbonate were added and the mass was agitated for 24 hours at room temperature. By this time the benzene solution was halogen free. The solvent was evaporated and the residue, which was presumably 'N-methylstearamido-methylol, was added gradually at room temperature to parts of. phosphorui trichloride. One hour later, 50 parts of aceti acid were added to'the clear thin solution and then allowed to stand at room temperature for one week. The reaction mass gradually changed to a syrup and then to a paste, presumably forming the phosphonedichloride. 7

After treating'the reaction product with dilute hydrochloric acid at temperature below 50 C; in the manner described in Example 1, a cheesy paste was obtained which dissolved in hot water, and more readily in the presence of some basic compound, to a clear solution. This product is presumably methyl-stearamido-methylene-phosphonic acid oi the formula 7 It analyzed: 3.69% nitrogen and 7.76% phoswas separated from the oily fatty acid, filtered ually added, to the point of incipient turbidity.

The crystalline product which separated was reand evaporated in vacuo. The crystalline residue thus obtained was recrystallized from a mixture of water and methyl alcohol. The product did not melt up to-240 C. and analyzed as follows: r

C=19.22%, H=6.4-1%,.N=11'.2%, P=24.94%'

Example 5.-'Disodium salt of product from Examplei and then 16.0parts of sodium hydroxide,

phosphorus, 8.29%. N=3.72%, P=8.2%.'

also dissolved in water, were added. The resulting disodium salt ismuch'm'ore soluble in water than the free acid and crystallizes upon concentrating the solution in large crystals. -The entire product was redoveredbyevaporatihg the solution to dryness on the water bath.

It in the above example 8.0 parts of sodium hydroxide are used instead of 16, the monosodium salt of amlnoethylene phosphonic acid is obtained; this compound is neutral to phenolphthalein and may be isolated as a crystalline,

colorless substance by evaporating the aqueous solution. By using 8.0 partsoi' sodium hydroxide and 11.2 parts oi potassium hydroxide, a mixed sodium-potassium salt may be obtained.

' Example 6.Ajrulatio11t 17.5 parts 01' thedisodium salt obtained in Example were dissolved in 300 parts of water together with 20 parts of sodium carbonate, 0.3

part of copper acetate and 30 parts of the sodium salt of l-amino-2-sulio-4-bromo anthraquinone. This mixture was heated for 3 hours close to the boiling. point. A gradual change 0! the color of the solution wasobserved, from a reddish j brownto a violet shade. After the conversion was complete 150 parts of sodium chloride were added and hydrochloricacid, until thesolutlon was acidic to litmus paper, and the mass was then allowed to cool oil. 34 parts of a product separated which wasextremely soluble in water and also in sodium chloride solution.

The product presumably was l-amino-z-sulioanthraquinone-4-imino-methyl-phosphonic acid of the formula and contained the expected amount of phosphorus for the above formula. It dyed wool from an acid bath in a violet shade.

Example 7.-Acylation 15 parts of the disodium salt of amino methylene phosphonic acid as prepared in the Example 5 were dissolved in 15 parts 01 water and then 18 parts of stearic acid chloride were added gradually with stirring. A thick homogeneous paste resulted. When all the stearic acid chloride was added, 4 parts of a solutionof sodium hydroxide were added, and the mass was thoroughly mixed in and heated for half an hour to 60 C.

The reaction product was recrystallized from alcohol and had the same properties as the stearamidomethyl phosphonic acid described in Example 1. It analyzed: Nitrogen, 3.80%; Calculated for CinHlooiN'P:

It will be understood that the above examples are merely illustrative and that many variations in the details of procedure are permissible, within the skill of those engaged in this art. Thus, in lieu of stearamido-methylene-phosphonic acid in Examples 1, 2 and 3 above, any other acyl-amidomethylene-phosphonic acid of the formula may be used, wherein R. is any organic radical,

for instance alkyl (lower or higher), aralkyl or aryl. Likewise, in lieu, of methyl-stearamidomethyl-phosphonic acid named inExample 4, any other secondary .acyl-amido-methylenephosphonic acid may be employed. Thus, starting with the various chloromethyl compounds obtained as final products in the various examples of U. S. P. 2,131,362, the following intermediate and iinal phosphonic acid compounds may be obtained:

(a) CH,OCONCH C1 (Ex. 20! U. S. P.2,131,362) --0 nHu CIlr0C0NCIl PO(OH) ---s CnHu-NH-CB -PO OH); Heptadecylimino-methylene-phosphonic acid (a) CHr-O-CO-N-CHgCl (Ex. 3, ditto) Secondary aminomethylene phosphonic acids may also be prepared by alkylation oi the primary amino-compound obtained in Example 1. By alkylation of the secondary amino-compounds, for instance the methylamino-methylene-phosphonic acid obtained in Example 4, tertiary amino-methylene phosphonic acids may be obtained.

By esteriiying the OH groups of the phosphonic acid radical with alcohols further novel organic derivatives may be obtained.

I claim:

1. A compound oithe group consisting of amino-methylene-phosphonic acid, its N-alkyl, N-aralkyl and N-aryl derivatives, and the normal and acid salts of any oi these.

2. 'A compound of the general formula wherein R stands for a member of the group consistlng oi hydrogen, alkyl, aralkyl, and aryl, while M and M designate cationic substituents. Y 3. A compound of thegeneral formula v V V NET-CH2- P= OM wherein M and M designate cationic substituents 4. A compound of the general formula I /0M AlkNH-CH -P=O wherein Alk designates a lower alkyl radical, while M and M? stand for cationic substituents.

5. A compound selected from the group consisting of amino-methylene phosphonic acid and its salts.

6. A compound selected from the group consisting of methylamino-methylene phosphonic acid and its salts.

7. The process of producing an organic compound which comprises subjecting to hydrolysis by the aid of mineral acid, at a temperature between 50'.C. and the reflux temperature of the mass, a compound selected from the group consisting of the acyl-amido methylene-phosphonic acids, the N carbo alkoxy amino methylene phosphonic acids, their corresponding N-alkyl, N-aralkyland N-aryl derivatives, and salts of any of these.

8. The process of producing an organic compound which comprlsessubiecting to hydrolysis by the aid of aqueous hydrochloric acid, at a temperature between 50 C. and the reflux temperature of the mass, a compound of the general formula 0M RCONCH2-P6 wherein R stands for a radical selected from the group consisting of alkyl and alkoxy; R desighates a member selected from the group consisting of hydrogen, alkyl, aralkyl and aryl; while M and M stand for cationic substituents.

- 9. The process of producing amino-methylenephosphonic acid, which comprises subjecting to hydrolysis by the aid of aqueous hydrochloric acid, at a temperature between C. and the reflux temperature or the mass; a. compound of the general formula group consisting of alkyl and alkoxy, while M and M represent cationic substituents.

JOSEF PIKL. 

